Have you done other upgrade besides upgrading LSWS from 4.0.x to 4.1RC1?
If it results in 503 error, it indicates trouble. I do some code comparison between two releases, see if I forgot update any thing in 4.1RC branch.

Have you done other upgrade besides upgrading LSWS from 4.0.x to 4.1RC1?
If it results in 503 error, it indicates trouble. I do some code comparison between two releases, see if I forgot update any thing in 4.1RC branch.

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I only upgraded from 4.0.4 to 4.1RC1. The log shows 4 503 errors since that but it rarely happens in the previous versions.